CN101883815A - Transparent film - Google Patents

Transparent film Download PDF

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Publication number
CN101883815A
CN101883815A CN2009801011960A CN200980101196A CN101883815A CN 101883815 A CN101883815 A CN 101883815A CN 2009801011960 A CN2009801011960 A CN 2009801011960A CN 200980101196 A CN200980101196 A CN 200980101196A CN 101883815 A CN101883815 A CN 101883815A
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Prior art keywords
resin
transparent film
refractory power
specific refractory
resins
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CN2009801011960A
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CN101883815B (en
Inventor
岸本广次
桥本真治
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Panasonic Holdings Corp
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松下电工株式会社
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00Use of pretreated ingredients
    • C08K9/08Ingredients agglomerated by treatment with a binding agent
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00Use of ingredients characterised by shape
    • C08K7/02Fibres or whiskers
    • C08K7/04Fibres or whiskers inorganic
    • C08K7/14Glass
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree

Abstract

A transparent film has a high glass transition temperature, yet retaining high transparency. The transparent film includes a glass fiber substrate impregnated with a resin composition in which a high refractive resin having refractive index higher than the glass fiber is mixed with a low refractive resin having refractive index lower than the glass fiber to have resultant refractive index approximate to that of the glass fiber when cured. The high refractive resin includes a cyanate-ester resin so as to increase a glass transition temperature, yet retaining high transparency.

Description

Transparent film
Technical field
The present invention relates to transparent film.
Background technology
JP2004-307851A is disclosed as Japanese patent application, has proposed transparent film as the alternative means that is used for such as the sheet glass of the flat-panel monitor of liquid-crystal display, plasma display and organic light emitting diode display.
An example of transparent film forms by prepreg being carried out hot pressing, and each prepreg is made of the glass fibre substrate that is impregnated with the transparent heat thermosetting resin, and the specific refractory power of described transparent heat thermosetting resin is similar to the specific refractory power of described glass fibre.The combination of the matrix resin that glass fibre and specific refractory power are similar to glass fibre can be avoided the improper refraction in transparent film inside, thereby guarantees the good visibility required as indicating meter.
Usually, use Resins, epoxy as the transparent heat thermosetting resin.For the specific refractory power that makes resin is similar to the specific refractory power of glass fibre, specific refractory power is higher than the dissimilar Resins, epoxy that glass fibre and specific refractory power be lower than glass fibre mixes with proper mixture ratio.
When forming transparent film above and below the Resins, epoxy of glass fibre respectively by the combination specific refractory power, the fine crack of the development at the interface between Resins, epoxy and glass fibre or peel off and may increase haze factor (haze factor), and reduce visibility meter thus.Therefore, proposed to use have lower glass transition temperatures Resins, epoxy to be suppressed at the fine crack at the interface between Resins, epoxy and the glass fibre or to peel off.
Yet,, therefore required to provide transparent film with high glass-transition temperature in the specific application area that needs high heat resistance owing to use Resins, epoxy can reduce the thermotolerance of transparent film with lower glass transition temperatures.
Summary of the invention
In view of the foregoing, the present invention has realized providing a kind of existing high-clarity that the transparent film of high glass-transition temperature is arranged again.
Transparent film according to the present invention comprises the glass fibre substrate of being made and be impregnated with resin combination by glass fibre, in this resin combination, the low refractive index resin that the high refractive index resins that specific refractory power is higher than glass fibre and specific refractory power are lower than glass fibre mix so that its when solidifying resulting specific refractory power be similar to the specific refractory power of glass fibre.The invention is characterized in that high refractive index resins comprises cyanate ester resin.
According to the present invention, cyanate ester resin guarantees to improve second-order transition temperature as the use of high refractive index resins, still keeps high-clarity simultaneously.In addition, cyanate ester resin at room temperature is a solid, improves touch dry degree and processing characteristics when the glass fibre substrate that is impregnated with resin in drying is with the preparation prepreg thus.
Preferably, resin combination has the above second-order transition temperature of 170 degree to obtain to have the transparent film of excellent heat resistance.
Low refractive index resin can be selected from the transparent film that A Hydrogenated Bisphenol A Resins, epoxy has high-clarity with acquisition.
A Hydrogenated Bisphenol A Resins, epoxy can be with resin combination impregnated glass fiber substrate and be dried the resin that is used to improve the solid type of touch dry degree and processing characteristics with preparation during prepreg.
Resin combination can comprise the curing initiator zinc octoate, in order to improve second-order transition temperature.
Further preferably, the specific refractory power of glass fibre substrate is 1.55 to 1.57, and the specific refractory power when high refractive index resins solidifies is 1.58 to 1.63, and the specific refractory power of low refractive index resin when solidifying is 1.47 to 1.53.
In addition, preferred stacked thickness more than one is the glass fiber sheets below the 50 μ m, so that give the transparency of improvement for transparent film.
Specific embodiments
Below, the transparent film according to the preferred embodiments of the invention is described.Transparent film comprises the glass fibre substrate that is impregnated with resin combination, and this resin combination is that specific refractory power is respectively above and below the high refractive index resins of the glass fibre of described substrate and the mixture of low refractive index resin.High refractive index resins is selected from the resin that comprises cyanate ester resin.Cyanate ester resin is wherein to have the polymkeric substance that forms triazine ring more than the cyanate esters trimerizing of a cyanate group in a molecule.Cyanate esters comprises the aromatics cyanate esters, for example 2, and 2-two (4-cyanogen oxygen phenyl) propane, two (3,5-dimethyl-4-cyanogen oxygen phenyl) methane, 2,2-two (4-cyanogen oxygen phenyl) ethane or derivatives thereof.Can use one type or dissimilar compounds to form cyanate ester resin.The cyanate ester resin of gained has the stiff molecule main chain, thereby has high glass-transition temperature when solidifying.And, because cyanate ester resin at room temperature is a solid, therefore it is being easy to be dried to touch dry with low refractive index resin impregnated glass fiber substrate after, and improvement is impregnated with the processing characteristics of the prepreg that the glass fibre substrate of resin combination obtains respectively by drying thus.
When selecting glass fibre to have 1.562 specific refractory power, cyanate ester resin preferably has about 1.6 specific refractory power.Usually, cyanate ester resin preferably has the specific refractory power in n+0.03 to the n+0.06 scope, and wherein n represents the specific refractory power of glass fibre.In the present invention, the specific refractory power of resin is meant the specific refractory power of resin under its solid state, and its test by ASTMD542 limits.
Low refractive index resin can be selected from any Resins, epoxy that specific refractory power is lower than glass fibre, and is preferably A Hydrogenated Bisphenol A Resins, epoxy.When selecting glass fibre to have 1.562 specific refractory power, low-refraction Resins, epoxy preferably has about 1.5 specific refractory power, and promptly in n-0.04 to n-0.08 scope, wherein n represents the specific refractory power of glass fibre.
The A Hydrogenated Bisphenol A Resins, epoxy of low-refraction can be the A Hydrogenated Bisphenol A Resins, epoxy with dihydroxyphenyl propane, Bisphenol F or bisphenol S.
In addition, the A Hydrogenated Bisphenol A Resins, epoxy of low-refraction is solid A Hydrogenated Bisphenol A Resins, epoxy under the room temperature preferably.Be the A Hydrogenated Bisphenol A Resins, epoxy of liquid under the room temperature although also can use, it can only be dried to when the preparation prepreg and refer to touch viscosity, and has therefore reduced the processing characteristics of prepreg.For this reason, be solid A Hydrogenated Bisphenol A Resins, epoxy under the preferred room temperature.The Resins, epoxy of low-refraction can be selected from the Resins, epoxy beyond the A Hydrogenated Bisphenol A Resins, epoxy, and for example 1,2-epoxy-4-(2-Oxyranyle) hexanaphthene.This Resins, epoxy and high refractive index resins are used in combination meticulous adjusting specific refractory power, and this Resins, epoxy also is chosen as the manufacturing that at room temperature is beneficial to transparent film for solid.
Therefore, transparent film of the present invention is used in combination high refractive index cyanate ester resin and the low refractive index resin such as A Hydrogenated Bisphenol A Resins, epoxy are similar to the glass fibre specific refractory power with preparation gained specific refractory power resin combination.Suitably select the ratio of mixture of high refractive index cyanate ester resin and low-refraction Resins, epoxy, so that the specific refractory power of gained is similar to the specific refractory power of glass fibre.The specific refractory power of expectation resin combination approaches the specific refractory power of glass fibre as much as possible, and preferred in the scope of n-0.02 to n+0.02, and wherein n represents the specific refractory power of glass fibre.
Resin combination is prepared as the second-order transition temperature that has more than 170 degrees centigrade.Have the above second-order transition temperature of 170 degree, then the transparent film of gained has high heat resistance.Although the upper limit for second-order transition temperature is not done concrete restriction, this upper limit is actual to be 280 degrees centigrade.The adjusting of second-order transition temperature is recently to carry out by the mixing that changes cyanate ester resin in the resin combination.Although depend on the type of the low refractive index resin that is used in combination with cyanate ester resin, during cyanate ester resin more than comprising 30 weight % in the resin combination, resin combination can be adjusted to has the above second-order transition temperature of 170 degree.
Resin combination can comprise the curing initiator (solidifying agent) that is selected from organic metal salt.Organic metal salt can be such as organic acids such as sad, stearic acid, acetylacetonate, naphthoic acid or Whitfield's ointments with such as the salt of metals such as Zn, Cu or Fe.Although can use one type or dissimilar salt, special preferably octanoic acid zinc for improving second-order transition temperature.The mixed volume of organic metal salt is preferably in 0.01 to 0.1PHR (umbers of per hundred parts of resins) scope in the resin combination, but is not limited thereto.
Scheme as an alternative, curing initiator is optional from the cation curing agent that is used for improving the resin transparent degree.Cation curing agent can be aromatics sulfonium salt, aromatics salt compounded of iodine, ammonium salt, aluminium chelate or boron trifluoride-amine coordination compound for example, but is not limited thereto.The mixed volume of cation curing agent is preferably in 0.2 to 3.0PHR scope in the resin combination, but is not limited thereto.
In addition, curing initiator can be selected from the curing catalysts that comprises tertiary amine, for example triethylamine and trolamine, 2-ethyl-4-imidazoles, 4-methyl-imidazoles or 2-ethyl-4-methyl-imidazoles (2E4MZ).The amount of curing catalysts but is not limited thereto preferably in 0.5 to 5.0PHR scope.
As mentioned above, resin combination is prepared from by the mixture of high refractive index cyanate ester resin, low-refraction Resins, epoxy such as A Hydrogenated Bisphenol A-Resins, epoxy and curing initiator.In case of necessity, the resin combination of gained is dissolvable in water or is scattered in the solvent to form resinous varnish.This solvent can be selected from benzene,toluene,xylene, methylethylketone, methyl iso-butyl ketone (MIBK), acetone, methyl alcohol, ethanol, Virahol, 2-butanols, ethyl acetate, butylacetate, propylene glycol monomethyl ether, propylene glycol methyl ether acetate, diacetone alcohol or N, N '-N,N-DIMETHYLACETAMIDE, but be not limited thereto.
Glass fibre is preferably selected from E-glass or the NE-glass that is used to improve shock resistance.E-glass is meant the non-alkali glass that is widely used as resin reinforcing glass fiber, and NE-glass is the trade(brand)name that can derive from the glass with low-k and low-dielectric loss character of " NITTOBO Incorporated ".Glass fibre preferably utilizes silane coupling agent to carry out surface treatment to improve shock resistance.The specific refractory power of glass fibre is preferably 1.55 to 1.57, and more preferably 1.555 to 1.565.The use of the glass fibre of specific refractory power in above-mentioned preferable range guarantees to provide the transparent film with excellent visibility meter.Glass fibre uses with the form of textile fabric or non-textile fabric.
Utilize resin combination varnish impregnation glass fibre substrate, then to its heating and dry with the preparation prepreg.Substrate preferably under 100 ℃~160 ℃ temperature dry 1~10 minute.
With two or more the prepreg of multi-disc is stacked on top of each other and carry out hot pressing and come curable resin composition, thereby obtain transparent film.Described hot pressing is preferably carried out 10~120 minutes under 150 ℃~200 ℃ high temperature, the pressure of 1MPa~4MPa, but is not limited thereto.
In the transparent film that forms thus, high refractive index cyanate ester resin and low-refraction Resins, epoxy for example A Hydrogenated Bisphenol A-polymerization of epoxy resins form resinous substrates, this resinous substrates shows high glass-transition temperature in the presence of cyanate ester resin, and therefore becomes the reason that acquisition has the transparent film of excellent heat resistance.In addition, because cyanate ester resin and the Resins, epoxy such as A Hydrogenated Bisphenol A-Resins, epoxy are good transparent material, so the transparent film of gained has kept the characteristic of highly transparent.In transparent film, introduce the glass fibre substrate of preferred 25 weight %~65 weight %, to give described film enhanced shock resistance and sufficient transparency by reinforcing effect.
Preferred stacked two or more the thickness of multi-disc be the glass fibre substrate of 10 μ m~50 μ m.In fact, the maximum number of substrate is set at 20.Though normally flood single substrate with resin combination and be dried with the preparation respective numbers prepreg, and stacked prepreg is carried out hot pressing obtain transparent film, but also the duplexer drying that can flood the duplexer of substrate and will be impregnated with resin with resin combination is preparing single prepreg, and this prepreg is hot pressed into transparent film.
The present invention is described by the following examples.
[embodiment 1]
The room temperature solid cyanate ester resin as high refractive index resins of 52 weight parts (can be derived from Lonza, trade(brand)name " BADCy ", 2,2-two (4-cyanogen oxygen phenyl) propane, specific refractory power 1.59), 48 weight parts comprises 1 as low refractive index resin, the solid epoxy of 2-epoxy-4-(2-Oxyranyle) hexanaphthene (can derive from Daicel ChemicalIndustrials, Ltd., trade(brand)name " EHPE3150 ", specific refractory power 1.51) and the zinc octoate as curing initiator of 0.02 weight part mix with the preparation resin combination.Then, in resin combination, add the toluene of 50 weight parts and the methylethylketone of 50 weight parts.The composition of gained is stirred down with preparation resin combination varnish at 70 ℃.This resin combination shows 1.56 specific refractory power when solidifying.
Then, the glasscloth thick with this resin combination varnish impregnation 25 μ m (can derive from Asahi Kasei EMD Corporation, trade(brand)name " 1037 ", E-glass, specific refractory power 1.562), then 150 ℃ down heating 5 minutes removing solvent and to make the resin semicure, thereby the preparation prepreg.
Then, two prepregs is stacked and place press, and hot pressing is 15 minutes under 170 ℃ and 2MPa pressure, and obtaining resin content thus is the thick transparent film of 80 μ m of 63 weight %.
[embodiment 2]
Take with embodiment 1 in identical mode prepare resin combination varnish, the room temperature solid Hydrogenated Bisphenol A-Resins, epoxy of just sneaking into 48 weight parts (can derive from JapanEpoxy Resin, trade(brand)name " YL7170 ", specific refractory power 1.51) as low refractive index resin.This resin combination shows 1.56 specific refractory power when solidifying.
Then, take with embodiment 1 in identical mode, utilize resin combination varnish to prepare prepreg, and with its with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 81 μ m of 63 weight %.
[embodiment 3]
With the prepreg of preparation among 3 embodiment 1 with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 91 μ m of 58 weight %.
[embodiment 4]
The room temperature solid cyanate ester resin as high refractive index resins of 52 weight parts (can be derived from Lonza, trade(brand)name " BADCy ", 2,2-two (4-cyanogen oxygen phenyl) propane, specific refractory power 1.59), 48 weight parts comprises 1 as low refractive index resin, the room temperature solid epoxy of 2-epoxy-4-(2-Oxyranyle) hexanaphthene (can derive from Daicel ChemicalIndustrials, Ltd., trade(brand)name " EHPE3150 ", specific refractory power 1.51) and 2-ethyl-4 Methylimidazole (2E4MZ) as curing catalysts of 1 weight part mix with the preparation resin combination.Then, in resin combination, add the toluene of 50 weight parts and the methylethylketone of 50 weight parts.The composition of gained is stirred down with preparation resin combination varnish at 70 ℃.This resin combination shows 1.56 specific refractory power when solidifying.
Then, take with embodiment 1 in identical mode, utilize resin combination varnish to prepare prepreg, and with its with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 83 μ m of 61 weight %.
[embodiment 5]
With the prepreg of preparation among the monolithic embodiment 1 with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 50 μ m of 68 weight %.
[embodiment 6]
The glasscloth thick with the resin combination varnish impregnation 80 μ m of embodiment 1 (can derive from Asahi Kasei Electronics, trade(brand)name " 3313 ", E-glass, specific refractory power 1.562), then 150 ℃ down heating 5 minutes removing solvent and to make the resin semicure, thereby the preparation prepreg.
Then, with the prepreg of monolithic with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 90 μ m of 52 weight %.
[comparative example 1]
The room temperature solid bisphenol A epoxy resin of 49 weight parts (can be derived from JapanEpoxy Resin, trade(brand)name " epicoat1006 ", specific refractory power 1.60), the room temperature liquid bisphenol F epoxy resin of 7 weight parts (can derive from DIC company, trade(brand)name " epiclon830S ", specific refractory power 1.61), 44 weight parts comprise 1 as low refractive index resin, the room temperature solid epoxy of 2-epoxy-4-(2-Oxyranyle) hexanaphthene (can derive from DaicelChemical Industrials, Ltd., trade(brand)name " EHPE3150 ", specific refractory power 1.51) and the SbF6-sulfonium salt as cation curing agent of 9 weight parts (can derive from SanshinChemical Industry Co., Ltd., trade(brand)name " Sl-150L ") mix with the preparation resin combination.Then, in resin combination, add the toluene of 50 weight parts and the methylethylketone of 50 weight parts.The composition of gained is stirred down with preparation resin combination varnish at 70 ℃.This resin combination shows 1.56 specific refractory power when solidifying.
Then, take with embodiment 1 in identical mode, utilize resin combination varnish to prepare prepreg, and with its with embodiment 1 in carry out hot pressing under the identical condition, obtaining resin content is the thick transparent film of 81 μ m of 63 weight %.
[comparative example 2]
Take with embodiment 1 in identical mode prepare resin combination varnish, the room temperature solid hydrogenated bisphenol A epoxy resin of just sneaking into 44 weight parts (can derive from JapanEpoxy Resin, trade(brand)name " YL7170 ", specific refractory power 1.51) as low refractive index resin.This resin combination shows 1.56 specific refractory power when solidifying.
Then, take with embodiment 1 in identical mode, utilize resin combination varnish to prepare prepreg, and with its with embodiment 1 in carry out hot pressing under the identical condition, obtain transparent film.
[comparative example 3]
Take with embodiment 1 in identical mode prepare resin combination varnish, the liquid alicyclic epoxy resin (can derive from Daicel ChemicalIndustries, Ltd., trade(brand)name " E-DOA ") of just sneaking into 44 weight parts is as low refractive index resin.This resin combination shows 1.56 specific refractory power when solidifying.
Then, take with embodiment 1 in identical mode, utilize resin combination varnish to prepare prepreg, and with its with embodiment 1 in carry out hot pressing under the identical condition, obtain transparent film.
For each transparent film that obtains among embodiment 1~6 and the comparative example 1~3, assessing aspect second-order transition temperature and the haze factor.Second-order transition temperature is measured according to JIS C6481 TMA method, and haze factor is measured according to JIS K7136.The results are shown in the following table 1.
Table 1
Figure GPA00001142965200091
(all amount of resin of sneaking into are all represented with weight part)
In addition, also embodiment 1~6 and comparative example's 1~3 prepreg is assessed aspect the processing characteristics.In table 1, for prepreg, " good " is meant and do not refer to touch viscosity and powder away, and " poor " is meant that existence refers to touch viscosity and powders away.
As shown in table 1, use cyanate ester resin to show up to second-order transition temperature more than 170 ℃ and low haze factor as the embodiment 1~6 of high refractive index resins, this transparent film that proves these embodiment has high glass-transition temperature, and has kept high-clarity.
As seen comparative example 1~3 for using bisphenol epoxy as high refractive index resins is lower than 170 ℃ lower glass transition temperatures in comparative example 1 and 2, and in comparative example 3 visible high haze factor or low transparency.
As shown in table 1, therefore use shows the low haze factor more than the embodiment 1~4 of the thick glasscloth of the 25 μ m of a slice, and shows the embodiment 5 of the glasscloth thicker than the 25 μ m that use monolithic and use the higher transparency of embodiment 6 of the thick glasscloth of 80 μ m of monolithic.

Claims (7)

1. transparent film comprises:
Make and be impregnated with the glass fibre substrate of resin combination by glass fibre, in described resin combination, the high refractive index resins that specific refractory power is higher than described glass fibre mixes with the low refractive index resin that specific refractory power is lower than described glass fibre, so that the specific refractory power of its gained when solidifying is similar to the specific refractory power of described glass fibre
Wherein said high refractive index resins comprises cyanate ester resin.
2. transparent film as claimed in claim 1, wherein
The second-order transition temperature of described resin combination is more than 170 ℃.
3. transparent film as claimed in claim 2, wherein
Described low refractive index resin comprises A Hydrogenated Bisphenol A Resins, epoxy.
4. transparent film as claimed in claim 3, wherein
Described A Hydrogenated Bisphenol A Resins, epoxy comprises the A Hydrogenated Bisphenol A Resins, epoxy of solid type.
5. transparent film as claimed in claim 1, wherein
Described resin combination comprises the zinc octoate as curing initiator.
6. transparent film as claimed in claim 1, wherein
The specific refractory power of described glass fibre substrate is 1.55 to 1.57,
The specific refractory power of described high refractive index resins is 1.58 to 1.63, and
The specific refractory power of described low refractive index resin is 1.47 to 1.53.
7. as each described transparent film in the claim 1~6, wherein will be that the described glass fibre substrate layer below the 50 μ m stacks more than 1 thickness.
CN2009801011960A 2008-02-18 2009-02-17 Transparent film Expired - Fee Related CN101883815B (en)

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JP2008036447A JP5022265B2 (en) 2008-02-18 2008-02-18 Transparent laminate
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PCT/JP2009/053133 WO2009104786A1 (en) 2008-02-18 2009-02-17 Transparent film

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CN101883815B (en) 2013-06-05
KR101201380B1 (en) 2012-11-14
WO2009104786A1 (en) 2009-08-27
EP2217653A1 (en) 2010-08-18
EP2217653B1 (en) 2013-08-14
TWI383010B (en) 2013-01-21
KR20100076038A (en) 2010-07-05

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